JP2022041793A - Low noise main bearing cover of internal combustion engine - Google Patents

Abstract

To provide a low noise main bearing cover of an internal combustion engine.SOLUTION: A low noise main bearing cover of an internal combustion engine includes a main bearing cover body. The main bearing cover body is connected to an internal combustion engine body main bearing seat, and installs a vibration control body on the main bearing cover body. Between the main bearing cover body and the vibration control body, a vibration control structure is installed. The main bearing cover body and the vibration control body are connected through a connection piece, and includes S-shaped structure and an oil film gap. In the vibration control body, an oil entering passage is installed, and the oil entering passage communicates with the oil film gap. A control problem in a vibration source of a main bearing caused by a load of the main bearing is solved.SELECTED DRAWING: Figure 1

Description

The present invention relates to the field of internal combustion engine technology, and particularly to a low noise main bearing cover of an internal combustion engine.

Currently, the demand for vibration and noise control of internal combustion engines is increasing, and the noise level of internal combustion engines is an important index for internal combustion engine design. Noise sources of internal combustion engines include combustion noise, mechanical noise, and aerodynamic noise. Among them, combustion noise and mechanical noise are called structural radiated noise and are radiated from the surface of the internal combustion engine structure. According to existing experimental results, the noise generated by the machine body and its accessories accounts for 50-70% of the total noise of the internal combustion engine, and the main bearing load mainly causes vibration and radiated noise of the vehicle body structure. Controlling the vibration caused by the load of the main bearing is the main method of low vibration and low noise design of the internal combustion engine because it is one of the main sources of vibration and is the main cause of vibration of the engine foot. There is one.

Currently, in the existing method of controlling the load and vibration transmission path of the main bearing of the internal combustion engine, the rib beam structure is mainly added near the main bearing and the diaphragm is thickened to increase the structural rigidity. The disadvantages of this approach are that the overall weight has increased significantly, the current control effect of internal combustion engine vibration and noise has reached its limit, and the load on the main bearing is still one of the main causes of the internal combustion engine noise structure. It is to be one.

At the same time, the main problems solved by related literature and reports on the control of structural vibration and radiated noise of internal combustion engines are improvement of the kinetic model of the crank connecting rod mechanism, optimization of the piston skirt profile, optimization of bearing lubrication performance, Crankshaft bending-twist coupled vibration analysis, optimization of crankshaft three-dimensional vibration model, etc., main bearing load or its vibration control is not considered to be the focal point.

Crankshaft vibration control mainly involves installing a torsional vibration damper to control the torsional vibration of the crankshaft, or installing a longitudinal vibration damper to control the axial vibration of the crankshaft and indirectly bending the crankshaft. Control vibration. However, the vibration of the main bearing is not effectively suppressed by the installation of the torsional vibration damper or the vertical vibration damper, and may be further strengthened. Therefore, in the prior art, little research has been conducted on the control method and control mechanism of the vibration damping of the main bearing of the internal combustion engine, and the vibration of the main bearing of the internal combustion engine is controlled, thereby controlling the vibration transmitted to the machine body. What to do is an important issue that needs to be resolved urgently.

It is an object of the present invention to provide a low noise main bearing cover for an internal combustion engine in order to solve a control problem of a main bearing vibration source caused by a main bearing load.

To achieve the above object, the present invention provides the following solutions:
A low-noise main bearing cover for an internal combustion engine, including a main bearing cover body, the main bearing cover body is connected to the main bearing seat of the engine, and a vibration isolator is installed on the main bearing cover body. An anti-vibration structure is installed between the bearing cover main body and the anti-vibration body, the main bearing cover main body and the anti-vibration body are connected via a connection piece, and the anti-vibration structure has an S-shaped structure and an oil film. The vibration isolator includes an oil entry passage, and the oil entry passage communicates with the oil film gap.

Preferably, the S-shaped structure penetrates along the axial direction of the main bearing cover body, the edges of the S-shaped structure are filleted, and the oil film gap is axially oriented in the main bearing cover body. It penetrates along and has S-shaped structures on both sides of the oil film gap.

Preferably, the connecting piece includes an arcuate limit key slot and an arcuate limit key, and the arcuate limit key slot is correspondingly installed at both ends of the main bearing cover body and the vibration isolator. An arc-shaped limit key is installed between the main bearing cover main body and the arc-shaped limit key slot of the vibration isolator.

Preferably, the arcuate limit key slot and the arcuate limit key are located at both ends of the oil film gap between the main bearing cover body and the anti-vibration body to limit the radial displacement of both ends of the anti-vibration body. , The arcuate limit key slot and the arcuate limit key are both curved and the arcuate limit key slot and the arcuate limit are used to allow the circumferential displacement of both ends of the vibration isolator. The center of curvature of the key coincides with the center of the main bearing.

Preferably, the oil entry passage penetrates along the radial direction of the vibration isolator and is used to allow lubricating oil to enter the oil film gap via the oil entry passage.

Preferably, two oil entry passages are symmetrically installed, the two oil entry passages are axially located at the center of the cross section of the vibration isolator, and each oil entry passage is on the same side. Located between two S-shaped structures, there are two corresponding oil film gaps, each of which is connected to one oil entry passage.

Preferably, an oil storage hole, which is a circular hole penetrating in the axial direction, is provided on the side of the vibration isolator near the oil film gap, and the oil storage hole is used to store lubricating oil. ..

Preferably, both sides of the main bearing cover body are connected to the end seal cover plate via end seal bolts.

Preferably, an end seal gasket is arranged between the end seal cover plate and the main bearing cover main body.

Preferably, the main bearing cover body is provided with a main bearing bolt hole, and the main bearing cover is fixed to the main bearing seat of the engine body by passing the main bearing bolt through the main bearing bolt hole.

Compared with the prior art, the present invention has achieved the following technical effects:
1. 1. The main bearing cover is machined with an S-shaped structure, oil film gap, oil entry passage, etc., and the additional quality is only the end seal cover plate, end seal bolt, end seal gasket, and the main of the internal combustion engine. Much smaller than the technical measures to increase the rigidity of the structure by adding a rib beam structure in the area near the bearing or by increasing the thickness of the diaphragm,
2. 2. The S-shaped structure and the structure such as the oil film gap are close to the main bearing hole, both of which play a role of vibration isolation, and are compatible with the existing main bearing cover, so they may be used alone, but the existing one. It may be used on the basis of the main bearing cover of, which can further dampen the vibration of the main bearing cover, greatly reducing the vibration transmitted from the main bearing bolt to the machine body, thereby reducing the vibration of the engine foot. Further reduction, reduction of vibration and noise of the whole machine,
3. 3. Lubricating oil in the oil film gap comes directly from the main bearing lubricating oil circuit and leaks into the oil pan through the gaps in the end seal cover plate, eliminating the need for additional lubrication and lubrication systems and the system is simple.

Schematic diagram of connection of each component of the low noise main bearing cover of the internal combustion engine of the present invention. Schematic diagram of the assembly structure of the low noise main bearing cover of the internal combustion engine of the present invention. Schematic diagram of assembly of end seal gasket and limit key of low noise main bearing cover of internal combustion engine of this invention Schematic diagram of vibration isolation structure, limit key slot, and oil storage hole structure of the low noise main bearing cover of the internal combustion engine of the present invention.

In order to more clearly explain the embodiment of the present invention or the technical solution of the prior art, the drawings required for the embodiments will be briefly introduced below, but the drawings in the following description are only a part of the present invention. It is clear that there is no such thing, and for those skilled in the art, other drawings can be obtained from these drawings without any creative work.

The technical solutions of the embodiments of the invention are described clearly and completely below in conjunction with the drawings of the embodiments of the invention, but the embodiments clearly described are not all examples. It is only a part of the embodiment of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the invention.

It is an object of the present invention to provide a low noise main bearing cover for an internal combustion engine in order to solve a problem of controlling a main bearing vibration source due to a main bearing load.

The above objectives, features, and advantages of the present invention will be described in more detail below, along with drawings and specific embodiments, so that they are clearer and easier to understand.

Example 1
As shown in FIGS. 1 to 4, the present embodiment provides a low noise main bearing cover for an internal combustion engine, includes a main bearing cover body 1, and the main bearing cover body 1 is connected onto a main bearing seat and is main. The bearing cover body 1 is provided with main bearing bolt holes 10 on both sides of the top, and during use, the main bearing cover body 1 is the main bearing of the machine body by allowing the in-bearing bolt to pass through the main bearing bolt hole 10. It is fixed to the seat.

In this embodiment, the anti-vibration body 2 is installed on the main bearing cover main body 1, the anti-vibration structure is installed between the main bearing cover main body 1 and the anti-vibration body 2, and the anti-vibration structure has an S-shaped structure. 3 and an oil film gap 4 are included. The vibration isolator 2 is provided with an oil entry passage 6 communicating with the oil film gap 4, and during operation, the lubricating oil between the main bearing bush and the main journal enters the oil film gap 4 via the oil entry passage 6. And can be satisfied. During operation, when the vibration isolator 2 receives a load from the main journal, it deforms and vibration isolation is performed mainly by the interaction between the squeeze film in the S-shaped structure 3 and the oil film gap 4 and the bearing cap main body 1.

In this embodiment, as shown in FIG. 4, the S-shaped structure 3 penetrates along the axial direction of the main bearing cover main body 1, and the edge of the S-shaped structure 3 is filledet-treated to prevent stress concentration. Of these, the S-shaped structure 3 is arranged at both ends of the oil film gap 4, and the material portion removed from the S-shaped structure 3 communicates with the oil film gap 4.

In this embodiment, the oil film gap 4 penetrates along the axial direction of the main bearing cover main body 1.

In this embodiment, the oil storage hole 5 is installed on the side of the vibration isolator 2 near the oil film gap 4, and the oil storage hole 5 is a circular hole penetrating in the axial direction, and the vibration isolator 2 and the main bearing cover are provided. It is used to store a certain amount of oil in order to prevent a shortage of oil in the oil film gap 4 and the oil entry passage 6 when the relative motion with the main body 1 is large.

In this embodiment, the oil entry passage 6 penetrates along the radial direction of the vibration isolator 2 and is used to allow the lubricating oil to enter the oil film gap 4 in the oil entry passage 6 path, and further, the oil entry passage 6 is used. Two symmetrically installed, axially located in the center of the cross section of the anti-vibration body 2, each oil entry passage 6 is located between two S-shaped structures 3 on the same side and corresponds. There are two oil film gaps 4, and the two oil film gaps 4 are distributed symmetrically between the main bearing cover main body 1 and the vibration isolator 2, and an oil entry passage 6 is connected to each oil film gap 4. S-shaped structures 3 are installed on both sides of each oil film gap 4, and a total of four S-shaped structures 3 are installed.

In this embodiment, the main bearing cover main body 1 and the vibration isolator 2 are connected via a connection piece including an arc-shaped limit key slot 12 and an arc-shaped limit key 11, and the main bearing cover main body 1 and the vibration isolator body 1 are connected to each other. Arc-shaped limit key slots 12 are installed at both ends of the oil film gap 4 between the two, and between the main bearing lid main cover 1 and the arc-shaped limit key slots 12 of the vibration isolator 2. Arc-shaped limit keys 11 used to limit radial displacement at both ends of the vibration isolator 2 and allow circumferential displacement at both ends of the vibration isolator 2 are installed. The arc-shaped limit key slot 12 and the arc-shaped limit key 11 both have a curvature, and the center of curvature of the arc-shaped limit key slot 12 and the arc-shaped limit key 11 coincides with the center of the circle of the main bearing.

In this example, the end seal cover plate 7 is connected to both sides of the main bearing cover body 1 via the end seal bolts 8, and the end seal gasket 9 is connected between the end seal cover plate 7 and the main bearing cover body 1. Is installed. The function of the end seal gasket 9 is to leave a cap as an oil discharge port of the oil film gap 4 between the end seal cover plate 7 and the vibration isolator 2, and the oil of the oil film gap 4 is left by the end seal gasket 9. It can flow only through the gap, has a throttle effect, and has a damping effect.

The above damping effect realizes the vibration-proof effect of the low-noise main bearing cover together with the S-shaped structure 3 between the vibration-proof body 2 and the main bearing cover main body 1, and the crankshaft load acts on the vibration-proof body 2. Then, due to the presence of the anti-vibration effect, the vibration transmitted to the machine body via the main bearing bolt is significantly reduced.

The main bearing vibration of the internal combustion engine occurs mainly before and after ignition of each cylinder, at which time the main bearing load is vertically downward and acts on the main bearing cover, the low noise main bearing cover provided by the present invention. By suppressing the vibration of the main bearing cover of the internal combustion engine or distributing the vibration energy, the vibration and noise of the internal combustion engine are effectively reduced.

In the present invention, specific examples are used to illustrate the principles and embodiments of the invention, but the description to examples above is provided only to facilitate understanding of the methods and core ideas of the invention. At the same time as being used, one of ordinary skill in the art may make modifications to a particular embodiment and scope of application, according to the ideas of the invention. In summary, the content of this specification should not be construed as limiting the invention.

Main bearing cover body 1, anti-vibration body 2, S-shaped structure 3, oil film gap 4, oil storage hole 5, oil entry passage 6, end seal cover plate 7, end seal bolt 8, end seal gasket 9, main bearing bolt Hole 10, arc-shaped limit key 11, arc-shaped limit key slot 12

Claims (10)

A low-noise main bearing cover for an internal combustion engine, including the main bearing cover body that is connected to the main bearing seat of the internal combustion engine body.
A vibration-proof body is installed on the main bearing cover body, a vibration-proof structure is installed between the main bearing cover body and the vibration-proof body, and the main bearing cover body and the vibration-proof body are connected via a connection piece. The anti-vibration structure includes an S-shaped structure and an oil film gap, and the anti-vibration body is provided with an oil entry passage so that the oil entry communicates with the oil film gap. Low noise main bearing cover for internal combustion engine. The S-shaped structure penetrates axially along the main bearing cover body, the edges of the S-shaped structure are filleted, and the oil film gap penetrates along the axial direction of the main bearing cover body. The low-noise main bearing cover for an internal combustion engine according to claim 1, wherein S-shaped structures are installed on both sides of the oil film gap. The connection piece includes an arc-shaped limit key slot and an arc-shaped limit key, and corresponding arc-shaped limit key slots are installed at both ends of the main bearing cover main body and the vibration isolator, and the main bearing cover main body is provided. The low-noise main bearing cover for an internal combustion engine according to claim 1, wherein an arc-shaped limit key is installed between the vibration-proof body and the arc-shaped limit key slot. The arc-shaped limit key slot and the arc-shaped limit key are located at both ends of the oil film gap between the main bearing cover main body and the vibration isolator, and both the arc-shaped limit key slot and the arc-shaped limit key have a curvature. The low-noise main bearing cover for an internal combustion engine according to claim 3, wherein the arc-shaped limit key slot and the center of curvature of the arc-shaped limit key coincide with the center of the main bearing. The low noise main bearing of an internal combustion engine according to claim 1, wherein the oil entry passage penetrates along the radial direction of the vibration isolator and is used to allow lubricating oil to enter the oil film gap in the oil entry passage path. cover. The two oil entry passages are symmetrically installed, the two oil entry passages are located at the center of the cross section of the vibration isolator in the axial direction, and the two oil entry passages are on the same side. The low noise main bearing cover of an internal combustion engine according to claim 5, which is located between the S-shaped structures and has two corresponding oil film gaps, and one oil entry passage is connected to each oil film gap. .. An oil storage hole is provided on the side of the vibration isolator close to the oil film gap, and the oil storage hole is a circular hole penetrating in the axial direction and is used for storing lubricating oil. Low noise main bearing cover for internal combustion engine as described in. The low noise main bearing cover for an internal combustion engine according to claim 1, wherein both sides of the main bearing cover body are connected to the end seal cover plate via end seal bolts. The low noise main bearing cover of an internal combustion engine according to claim 8, wherein an end seal gasket is arranged between the end seal cover plate and the main bearing cover main body. The main bearing cover main body is provided with a main bearing bolt hole, and the main bearing cover main body is fixed to the main bearing seat of the internal combustion engine main body by passing the main bearing bolt through the main bearing bolt hole according to claim 1. The low noise main bearing cover for the internal combustion engine described.

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